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Analog Devices Inc./Maxim Integrated MAX793RESE+T
- Part No.:
- MAX793RESE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793RESE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,771
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Product details
Overview
MAX793RESE+T from Maxim Integrated is a 3.0V/3.3V microprocessor supervisory circuit with fixed reset threshold (2.55V–2.70V), backup-battery switchover, active-low open-drain RESET output, and integrated chip-enable gating for CMOS RAM protection. It guarantees reset assertion down to VCC = 1V and supports battery voltages exceeding VCC (e.g., 3.6V Li). Used in portable controllers and embedded systems requiring reliable power monitoring during brownout or main supply loss.
For engineers reviewing the MAX793RESE+T datasheet, MAX793RESE+T pinout, MAX793RESE+T application, or MAX793RESE+T equivalent, key selection criteria include its R-suffix reset threshold range (2.55V–2.70V), guaranteed reset hold time (200ms), battery-switching behavior (VSW = 2.52V typ), CE IN-to-CE OUT propagation delay (≤7ns), and BATT OK output functionality (VBOK = 2.0V min).
Technical Context
The MAX793RESE+T implements a precision voltage-monitoring comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions near the reset threshold (VRST = 2.55V–2.70V). Its internal p-channel MOSFET switch enables seamless switchover from VCC to VBATT when VCC falls below VSW (2.52V typ), with <15mV hysteresis on the VCC-to-VBATT comparator.
It integrates a dedicated low-line warning comparator (LOWLINE) with adjustable trip point relative to VRST (VLR = VRST − 25mV typ), a manual reset input (MR) with 70µA internal pullup and 200ms timeout, and a 7ns max CE IN-to-CE OUT propagation delay for real-time chip-enable gating during undervoltage events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Range | 2.55V to 2.70V (R-suffix); ensures reliable reset before 3.0V system brownout |
| Battery Switch Threshold (VCC↓) | 2.52V typical; triggers switchover to backup battery before reset asserts |
| Reset Timeout Period | 200ms minimum; holds µP in reset long enough for stable power recovery |
| CE IN-to-CE OUT Propagation Delay | ≤7ns; prevents RAM corruption during fast VCC droop without timing margin loss |
| BATT OK Threshold | 2.00V minimum; confirms lithium battery remains above functional voltage before backup use |
| VCC Supply Current (Normal Mode) | 46µA typical at +25°C; enables ultra-low-power operation in battery-backed systems |
| Guaranteed Reset Assertion | Down to VCC = 1V; maintains reset validity even during deep undervoltage conditions |
Pinout & Package
MAX793RESE+T is housed in a 16-pin narrow SO (SOIC-16) package with 1.27mm pitch, RoHS-compliant lead-free finish (+T suffix), and operating temperature range of 0°C to +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Supply output for CMOS RAM | Switches between VCC and BATT via internal p-MOSFET; connects to VCC when VCC > VRST or > VBATT |
| VCC (Pin 2) | Main supply input | Primary 3.0V/3.3V power rail monitored for reset and low-line detection |
| GND (Pin 6) | Ground reference | Common return for all analog comparators, digital outputs, and internal switching |
| PFI (Pin 4) | Power-fail comparator input | Monitors external voltage (e.g., +5V rail); pulls PFO low if VPFI < 1.212V or VCC < VSW |
| PFO (Pin 7) | Power-fail comparator output | Open-drain logic-low alert when PFI or VCC drops below thresholds; used to enable battery freshness seal |
| RESET (Pin 15) | Active-low open-drain reset output | Drives µP reset line low for ≥200ms; requires external pullup to VCC (4.7kΩ–1MΩ) |
| RESET (Pin 13) | Active-high reset output | Sources/sinks current; inverse of RESET; usable for direct µP reset or interrupt inputs |
| MR (Pin 8) | Manual reset input | Logic-low assertion triggers 200ms reset pulse; internal 70µA pullup allows switch-only interface |
| WDI (Pin 10) | Watchdog input | Accepts µP-generated pulses; absence >1.6s triggers WDO low (MAX793 only) |
| WDO (Pin 9) | Watchdog output | Open-drain fault indicator; low if WDI idle >1.6s; diode-ORable to MR for auto-reset |
| CE IN (Pin 11) | Chip-enable input | Passes CE signal to CE OUT only when reset inactive; high-impedance during reset |
| CE OUT (Pin 12) | Chip-enable output | Gate-controlled CE path to RAM; disabled during reset to prevent write corruption |
| LOWLINE (Pin 14) | Early power-fail warning output | Active-low NMI trigger when VCC falls to VLR = VRST − 25mV; enables preemptive shutdown |
| BATT (Pin 16) | Backup-battery input | Accepts 3.6V Li battery; VBATT may exceed VCC; disconnects via freshness seal until first power cycle |
| BATT ON (Pin 5) | Battery status driver output | Logic-high when OUT connected to BATT; drives external PMOS base/gate for >75mA load |
| BATT OK (Pin 3) | Battery health monitor output | High when VBATT > 2.0V and VCC > VSW; low otherwise; indicates battery readiness |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | Fixed 2.55V–2.70V threshold with 10mV hysteresis prevents chatter during VCC edge transitions |
| Backup-battery switchover | Internal p-MOSFET enables seamless transition to 3.6V Li battery even when VBATT > VCC |
| Chip-enable gating | 7ns max CE IN-to-CE OUT delay ensures RAM write integrity during sub-100ns VCC droops |
| Low-line early warning | LOWLINE output asserts 25mV before reset threshold, enabling NMI-based graceful shutdown |
| Battery freshness seal | Disconnects BATT from internal circuitry until first VCC cycle, preserving shelf life of backup battery |
| Guaranteed reset to 1V | Ensures µP remains held in reset even during deep brownout, preventing undefined execution |
Applications
| Battery-Powered Portable Controllers | Embedded Industrial Controllers |
|---|---|
Use Scenario: Handheld data loggers powered by primary AA cells with optional 3.6V Li backup battery. IC Role / Device Role / Timing Role: Supervises main 3.0V rail, switches RAM supply to battery upon main rail collapse, and asserts LOWLINE 25mV pre-reset to initiate flash save. Use Value: Prevents data loss during battery swap or main supply interruption using deterministic 200ms reset hold and sub-7ns CE gating. | Use Scenario: Programmable logic controller (PLC) I/O module with nonvolatile RAM retaining configuration across AC power cycles. IC Role / Device Role / Timing Role: Monitors 3.3V system rail, gates CE to SRAM during undervoltage, and provides BATT OK status to firmware for battery health reporting. Use Value: Eliminates need for external power-fail logic and discrete MOSFET switchover, reducing BOM count by 4 components. |
| Critical Microprocessor Power Monitoring | Intelligent Edge Sensors |
Use Scenario: Medical infusion pump MCU requiring fail-safe reset during 3.3V rail sag caused by motor startup current. IC Role / Device Role / Timing Role: Detects VCC drop below 2.55V, asserts open-drain RESET within 1µs, and disables CE to prevent corrupted EEPROM writes. Use Value: Guarantees deterministic reset assertion down to VCC = 1V, avoiding race conditions that could cause unsafe actuator motion. | Use Scenario: Wireless sensor node with ultra-low-power sleep mode and 3.6V coin-cell backup for RTC and calibration data. IC Role / Device Role / Timing Role: Provides BATT OK status to MCU, enables battery freshness seal during factory programming, and monitors VCC for wake-up validation. Use Value: Extends shelf life of backup battery by >2 years via automatic disconnection until first power-on, verified by BATT OK output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SESE+T | Reset threshold 2.85V–3.00V (S-suffix); higher trip point better suited for 3.3V ±10% supplies | Used where system brownout occurs closer to 3.0V; less margin for 3.0V nominal rails | Select when VCC tolerance requires earlier reset assertion than R-suffix allows |
| MAX793TESE+T | Reset threshold 3.00V–3.15V (T-suffix); optimized for 3.3V ±5% systems with tight regulation | Preferred for high-precision 3.3V supplies where 3.15V dropout is acceptable | Choose for applications needing maximum VCC headroom before reset, e.g., FPGA configuration circuits |
Compared with MAX793SESE+T and MAX793TESE+T, the MAX793RESE+T provides the lowest reset threshold (2.55V–2.70V), making it uniquely suitable for 3.0V systems or designs requiring extended operation during deep brownout-critical for battery-powered equipment where every millivolt of VCC margin extends runtime.
Availability
MAX793RESE+T is available at Aetrix Electronics and suitable for battery-powered portable controllers, embedded industrial controllers, and critical microprocessor power monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX793RESE+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX793 family is designed as a 3.0V/3.3V microprocessor supervisory solution with integrated battery switchover, RAM protection, and early-warning capability-targeting portable, medical, and industrial systems where power reliability is mission-critical.
FAQ
What is the exact reset threshold voltage range for MAX793RESE+T?
The MAX793RESE+T has a fixed reset threshold range of 2.55V to 2.70V (R-suffix), specified for VCC falling. This range ensures reset assertion before a 3.0V system drops below functional levels, with 10mV typical hysteresis to prevent chatter. The threshold is factory-trimmed and does not require external resistors-unlike the MAX794, which uses an adjustable divider.
How does the battery freshness seal work on MAX793RESE+T?
The MAX793RESE+T battery freshness seal disconnects the BATT pin from internal circuitry until the first valid power cycle. To activate it: apply VBATT, ground PFO while bringing VCC above VRST, hold until reset deasserts (≥200ms), then cycle VCC. Once enabled, the seal remains active until VCC exceeds VRST again. This preserves shelf life of the 3.6V lithium backup battery.
Can MAX793RESE+T be used with a 3.6V lithium battery while the main supply is 3.3V?
Yes. The MAX793RESE+T explicitly supports VBATT > VCC, including 3.6V lithium batteries in 3.3V systems. Its internal p-channel MOSFET switch safely routes OUT to BATT when VCC falls below VSW (2.52V typ), and the battery leakage current is limited to 1µA (max) when freshness seal is enabled-ensuring minimal self-discharge.
What is the function of the BATT OK output on MAX793RESE+T?
The BATT OK output on MAX793RESE+T is a logic-high signal indicating that the backup battery voltage (VBATT) exceeds 2.0V minimum and that VCC is above VSW. It is continuously monitored when reset is not asserted. If VBATT drops below 2.0V or VCC falls below VSW, BATT OK goes low-providing firmware with real-time battery health status for predictive maintenance.
Does MAX793RESE+T include a watchdog timer?
No. The MAX793RESE+T does not include a watchdog timer. Watchdog functionality (WDI/WDO) is present only in the MAX793 and MAX794 variants-not in the MAX795, and not differentiated by suffix. Since MAX793RESE+T is a MAX793 variant, it does include the 1.6s watchdog timer, WDI input, and WDO output. This is confirmed by the "MAX793/MAX794 only" feature callouts in the datasheet's Features table and Detailed Description sections.
MAX793RESE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX793RESE+T FAQ
1.How can I place an order for MAX793RESE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793RESE+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX793RESE+T reliable?
The price and inventory of MAX793RESE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793RESE+T is usually 5 days.
3.What payment methods are accepted for MAX793RESE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793RESE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793RESE+T?
MAX793RESE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793RESE+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX793RESE+T?
For technical support, including MAX793RESE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793RESE+T requirements.
6.How does Aetrix verify that MAX793RESE+T is sourced from the original manufacturer or authorized distributors?
All MAX793RESE+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX793RESE+T meets industry standards.
7.What is the process for return or replacement of MAX793RESE+T?
All MAX793RESE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX793RESE+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX793RESE+T part is unused and in its original packaging.
Return procedure for MAX793RESE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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